Belt



July 9, 1946. l F, G. SKI-WMS 2,403,617

' BELT v i Filed Aug.v 25, 1943 Patented July 9, 1.946

UN-'VlilglYv ES PAT OFFICE y t 2,493,617." BELT Ema. G...skeshanakkrtn, omo.assigmr Yto 'rileL BL- ELG'omricIi; Ghmpanygllew 'York N Y; a

corporation ofiNew Yorkv f l Application August-25, 194s, serialV No. 500,013;

" @claims-' (Cuve-232) 'Ichi-s invention ,relates tor belts or; reinforceri-4v rubberror other, nubberl-ileematerial, andtcfthe.

manufacture: thereof(v is. especiallyH usefuLin belts-1 of theat type: fon conveyors, or.` for. power transmission; Y

Inbelts. of prion construction-,- difliculty has been yexperienceclr especially f with. s'm-rthetic,r rubber materials as. distinguished l from ,natu-ral, rubber, in securing the desired strength of adhesion ofrthezcoyentaqtherjedge of the belt.V When a heavy gauge type cover has been folded around the edge of the fabric body, and trimmed even with the bottom of the carcass, the edge thus formed sometimes has not effectively adhered to the fabric plies, or the lbottom cover, and sometimes has admitted' soapstone or other foreign matter, and the joint at times has opened during vulcanization. f

The principal objects of the inventionare to provide for security of attachment, to provide for resistance to separation along theedges ofv the belt, to provide effective cover protection to the'edges of the belt as Well as the working faces.r thereof, to provide for longer belt life, and to;

provide for economical and convenient manufacture.

These and further objects will be apparent from the following descriptionreference being had to the accompanying drawing in which,

Fig. 1 is a cross-section and perspective view of the belt constructed in accordance with and embodying the invention, parts being broken away for the purpose of illustration.

Fig. 2 is a cross-section and perspective viewA of the belt structure at astage of manufacture.

Fig. 3 is a cross-sectionA of a modified construction.

Fig. 4 is a View like Fig. 3 showing a further modified construction.

Referring to the embodiment of the invention shown in Figs. 1 and 2, the belt comprises a body 5 of superimposed strength-giving plies of fabric or cord material or both, and surrounding these plies is a layer 6 of loosely woven or other open mesh fabric which may enclose four sides of the slab comprising the tension rbody and helps to unite the fabric layers to atop cover 1 and bottom cover 8, this open-mesh fabric being thus desirable in some cases. The material of the top cover 'l may be of a suitable wear-resisting rubber or other rubber-like material and relatively thick for wear-resistance and cushioning. The bottom cover 8, which ordinarily is not subjected to as high a degree of wearas the topy cover, may

VIn order. izo-anchor the, rubber coversl andl' alongtheledges of' the, belt securely to; .the fabric..of `thebody 5,the. outer cover. 1 isjfurnisheddn suiiicient width and thicknessin its unvulcani'z'ed state, as shown perhaps |more clearly in the assembly stage of Fig. 2, so that the cover can be rbrought aroundthey edges of the longer plies, cut

and t to ll the recesses I0. Thus, at each side of the belt the cover 1, being bent around the wider plies of the body 5 and t securely to the plies at the recess, forms the edge of the belt.- The bottom cover 8 of the belt is formedby a somewhat lighter gauge stock and is securely adhered to the bottom of the belt and the margin of the top cover stock that extends into the recess HJ. The body and the cover of the belt thereafter is vulcanized under heat and pressure into a belt of united structure.

The belt construction provides edges of the belt that are substantially integral with the cover, and in addition a construction to provide increased strength of anchorage of the cover stock, 1 and 8, to the body of the belt 5.

Referring-to the embodiment in Fig. 3, a belt construction is shown where a different arrangement is provided for tying the bottom cover stock 22 at the recesses 25 on the lower periphery of the belt. In this construction, the light gauge bottom cover 22 instead of terminating at the edge of the belt, is folded around into the recess 25 at the bottom of the belt, trimmed and terminated at the edge of the wider plies 20 comprising the body of the belt'. Then the thicker-gauge top cover stock 23 is folded around the edge of the belt, trimmed and t over the bottom cover into the recess 25 at the bottom margin of the belt, the narrow plies 24 being shortened to the extent that the recess thus formed will bey capable of holding the stock without objectionable bulging beyond the desired contour of the belt. A layer 2| of loosely woven or other open mesh fabric Ymay be included between the cover stock and adjacent plies.

Referring to the embodiment in Fig. 4, the belt hasa modified construction for tying the bottom cover 32 to the body of the belt. Instead of narrow plies 33 only at the bottom of the belt be thinner and of a suitable rubber-like material. to provide a recess 35 for the anchorage of the top cover to the body of the belt, one or several of the upper plies 34 are likewise made narrower to provide similar recesses 36 to receive the margins of the bottom cover stock 32. These upper recesses 36 provide additional anchorage of the bottom cover 32 to the body of the belt. The bottom cover s tocklis of suii'cient width Vto 4foldinnto the bottom' recess made .by the narrow plies'; up and over the wider plies and into the'recess provided by the narrow plies at the upper-margin of the belt, cut and terminated there. Then the top cover of heavier gauge stock is folded around i the bottom cover, cut and terminatedin the lower recesses as illustrated in the drawing.

This provides a strong construction especially at the edges of the belt Without using excessively y heavy gauge top cover stock.

Variations may be made without departing fromE the invention as it is hereinafter claimed.

I claim:

l. A belt comprising a body ofV reinforcing material having a longitudinally extending rabbet in a margin of a face thereof open to said face' and the edge of said body, and a covering of rubber-like material extending entirely ,about said body andrhavng a longitudinally extending lapped splice seated invsavid rabbet thereby providing increased corner ledge thickness of said rubber-likematerial as compared to other portions of said covering,.said beltbeing a 'vulcanized unitary construction.

Vstepped back to provide marginal recesses at its lower edges, a lower cover of rubber-like mate- Yrial extending into said recesses, a top cover of rubber-like material of a width to cover the edges of said body and extending into said recess and `overlapping the bottom cover, said body and covers. being mold-vulcanized into a united belt structure.

4. A belt comprising a strength-giving body of yplied fabric material, said body being marginally recessed at its upper and lower edges, a bottom cover of flexible rubber-like material of a width to extend into said recesses, a top cover of rubberlike material and of a width to be received in over` lapping relation with said bottom cover about all said recesses and said body and covers being moldvulcanized into a" united belt structure. 

